Home Automation 433mhz

Sep 08, 2016

The Raspberry Pi has GPIO pins that can read 3.3v digital signals. Luckly there is a very common 433Mhz sender/receiver you can directly connect to the pins. From there you just need to setup the software and you can control 433mhz devices, like the intertechno IT-1500 3 outlets.

Software

The pilight project already implements most of the common protocols. It comes with a customizable webinterface and can be controlled over websockets.

To integrate the outlets into Apple HomeKit I used the node.js app Homebrige with a plugin.

Hardware

The 433mhz sender and receiver come as package, you can find them on ebay. But check that you order the FS1000A XY-FST, not his brother 2008-8 which is for 315mhz.

Voltage Divider

The Raspberry Pi has 5v and 3.3v output, but only 3.3v input. To convert the signal from 5v to 3.3v:
5v * (470Ω / (330Ω + 470Ω)) = 2,93v.

Antenna

I just used a single core, 164mm long wire. But there is some dark magic behind this, google to find out more.